In my Cahuilla Grammar (Seiler 1977:276-282) and in a subsequent paper (Seiler 1980:229-236) I have drawn attention to the fact that many kin terms in this language, especially those that have a corresponding reciprocal term in the ascending direction – like niece or nephew in relation to aunt – occur in two expressions of quite different morphological shape. The following remarks are intended to furnish an explanation of this apparent duplicity.